NEW YORK, NY - AUGUST 18: Customers pick up their orders from Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

Photo: Andrew Burton

NEW YORK, NY - AUGUST 18: Customers pick up their orders from...

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NEW YORK, NY - AUGUST 18: People wait in line at Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

Photo: Andrew Burton

NEW YORK, NY - AUGUST 18: People wait in line at Shake Shack on...

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NEW YORK, NY - AUGUST 18: People sit outside Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

Photo: Andrew Burton

NEW YORK, NY - AUGUST 18: People sit outside Shake Shack on August...

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NEW YORK, NY - AUGUST 18: People sit outside Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

NEW YORK, NY - AUGUST 18: People wait in line at Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

Photo: Andrew Burton

NEW YORK, NY - AUGUST 18: People wait in line at Shake Shack on...

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NEW YORK, NY - AUGUST 18: A Shake Shack burger is displayed on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

NEW YORK, NY - AUGUST 18: People wait in line at Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

NEW YORK, NY - AUGUST 18: A customer picks up her order from Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

Photo: Andrew Burton

NEW YORK, NY - AUGUST 18: A customer picks up her order from Shake...

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NEW YORK, NY - AUGUST 18: Customers pick up their orders from Shake Shack on August 18, 2014 in Madison Square Park in New York City. Shake Shack is allegedly considering going public and holding an initial price offering (IPO). (Photo by Andrew Burton/Getty Images) ORG XMIT: 507811691

It started in the summer of 2001 as a hot dog truck in Manhattan's Madison Square Park, expanded in 2004 to a kiosk that also sold hamburgers, fries and shakes, and has become a global burger business. Now Shake Shack is reportedly considering going public and holding an initial price offering.